Carefully butterfly the chicken breasts by slicing them horizontally to create four thinner cutlets. Season both sides with salt and black pepper.
Place the flour in a shallow bowl and season lightly with salt and pepper.
In a second bowl, beat the eggs until well combined.
In a third bowl, mix the panko bread crumbs, grated parmesan, oregano, red pepper flakes, and garlic powder.
Dredge each chicken piece in flour, shaking off excess. Dip into the eggs, then coat in the panko mixture, pressing gently so the crumbs stick.
Preheat the air fryer to 400°F (200°C).
Arrange the breaded chicken in a single layer in the air fryer basket.
Cook for about 5 minutes per side until the chicken is nearly cooked through and golden.
Spoon marinara sauce over each piece and sprinkle with shredded mozzarella.
Return the chicken to the air fryer and cook for another 3 minutes until the cheese melts and becomes slightly golden. This finishing step completes the delicious air fryer chicken parmesan.
Garnish with fresh parsley and serve immediately.